Re: [PATCH v10 2/3] tracepoint: Make rcuidle tracepoint callers use SRCU

[Peter Zijlstra]

On Fri, Jul 13, 2018 at 02:55:46PM -0700, Joel Fernandes wrote:
> +		/* keep srcu and sched-rcu usage consistent */		\
> +		preempt_disable_notrace();				\
> +									\
> +		/*							\
> +		 * For rcuidle callers, use srcu since sched-rcu	\
> +		 * doesn't work from the idle path.			\
> +		 */							\
> +		if (rcuidle)						\
> +			idx = srcu_read_lock_notrace(&tracepoint_srcu);	\
> +		else							\
> +			rcu_read_lock_sched_notrace();			\

That else is completely superfluous. rcu_read_lock_sched_notrace() :=
prempt_disable_notrace().